@Injectable()
export class AuthGuard implements CanActivate {

    constructor(
        private router: Router,
        @Inject(PLATFORM_ID) private platformId: Object,
        private authService: AuthenticationService
    ) { }

    canActivate() {
        if (isPlatformBrowser(this.platformId)) {
            if(this.authService.auth2) {
                if (this.authService.loggedIn()) {
                    return true;
                } else {
                    this.router.navigate(['/login']);
                    return false;
                }
            }
        }
    }
}

@Injectable()
export class AuthenticationService {
    token = new Subject<String>();
    auth2;
    auth2access;


    constructor(
        private router: Router,
        @Inject(PLATFORM_ID) private platformId: Object
    ) {
        if (isPlatformBrowser(this.platformId)) {
            try {
                this.token.next(sessionStorage.getItem('token'));
                gapi.load('auth2', () => {
                    this.auth2 = gapi.auth2.init({
                        client_id: '*.apps.googleusercontent.com'
                    }).then( () =>
                    {
                        //var googleAuthTest = gapi.auth2.getAuthInstance();
                        console.log(gapi.auth2.getAuthInstance().isSignedIn.get());
                        if(gapi.auth2.getAuthInstance().isSignedIn.get() == false) {
                            this.revoke();
                        }else{
                            this.auth2access = gapi.auth2.getAuthInstance();
                        }
                    });
                });
            } catch (ex) {  }
        }
    }

    public backendAuth(id_token ,action) {
        var result = new BehaviorSubject<string>('');
        var xhr = new XMLHttpRequest();
        xhr.open('POST', 'https://callum.tech/auth/verify.php');
        xhr.setRequestHeader('Content-Type', 'application/x-www-form-urlencoded');
        xhr.onload = function() {
            result.next(xhr.responseText);
        };
        xhr.send('id_token=' + id_token + "&action=" + action);
        return result.map(x => x);
    }

    public  loggedIn(): boolean {
        if (isPlatformBrowser(this.platformId)) {
            if(this.auth2) {
                return gapi.auth2.getAuthInstance().isSignedIn.get();
            }
        }
        /*if (isPlatformBrowser(this.platformId)) {
            if(this.auth2) {
                return gapi.auth2.getAuthInstance().isSignedIn.get();
            }
        }*/
    }

    public revoke()  {
        if (isPlatformBrowser(this.platformId)) {
            gapi.auth2.getAuthInstance().signOut();
        }
    }
}